Mechanical stoker.



No. 703,450. 0 Patented July I, I902.

A. F. NAGLE.

MECHANICAL S-TOKER.

(Application filed July 6, 1901.) (No Model.) 3 Shasta-Sheet I.

Patented July I, I902. A. F. NAGLE.

MECHANICAL STOKER.

(Application filed July 8, 1901.)

3 Sheets-Sheet 2,

- TTELE.

(No Model.)

v I I I I I I lll| II III.-

w nun-ii No. 703,450. Patented lu|y 1902.

A. F. NAGLE.

MECHANICAL 'STDKER. A lie'atibn filed July 6, 1901.

' 3 Sheets-sheaf a.

(No Model.)

in: unnms' PEIERS coy. Putnam-ma, wAsmNoYom u. c.

' UNITED STATES PATENT OFFICE.

AUGUSTUS F. NAGLE, OF MONTCLAIR, NEW JERSEY, ASSIGNOR TO EARLE H.GOWING, OF READING, MASSACHUSETTS.

MECHANICAL STOKER.

SPECIFICATION forming part of Letters Patent No. 703,450, dated July 1,1902.

Application filed July 6, 1901. Serial No. 67,343. (No model.)

To all whom it 77%(LZ/007ZCQ77L. I

Be it known that I, =AUGUSTUS F. -NAGLE, of

Montclair, in the county of Essex andState of New Jersey, have inventedcertain new and of which the following is a specification.

My invention relates especially to furnaces having an inclined bottomand to stokers therefor in which the screw conveyer supplies to coalcontinuously'to the rear end of the furnace and deposits it upon theupper portion of the inclined bottom, down which it is carried bygravity and-by the impelling force of thescrew. These inclined bottomplates are corrugated longitudinally, made independently removable, andare separated by raised. myers, which supplyblasts of hot air-projectedlaterally downward from vents in the'upper part of each lateral face. Iprovide a plu- 2o rality of screwv conveyers, each discharging down theincline at the rear of the furnace between adjacent rows of twyers inthe directiontoward-the furnace-door. These conveyers may lead directfrom a hopperbeyond the rearwall; but under a special feature of myinvention the main conveyer rises 0bliquely beneath the furnace-bottomfrom the hopper in front to a transfer-chamber in the rear, whereanother screw, geared to the shaft of the main screw, reverses thedirectionof movement of the coal and discharges it into the furnace. Atthe foot of the incline there are horizontal bottom plates, on which.also combustion occurs, and ashesgatherto be re- 3 5 moved through thefront door'on alevel therewith. An opening is formed through the frontwall at a higher level and provided with a transparent or other door toafford a view of the interior of the furnace.

In the drawings, Figure 1 is a longitudinal vertical section through afurnaceand stokingapparatnsembodyingmyinvention. Fig. 2 is a transversevertical section thereof on line 2' 2 'of Fig; 1. Fig. 3 is avertical-section 5 showing the hopper at rear of the furnacem' Figs. 4,5, and 6 are details of the reversing;

conveyer, and Fig. 7 an enl a rged cross-sec:

tion of the peculiar twyer and floor-supports "inspection of theinterior of chamber E. 5 useful Improvements inMechanical Stokers, j

D is the boiler, suitably mounted over the fireor combustion chamber E,F the ashdoor, and G an openingin the front wall for The floor I of thecombustion-chamber at V the front is' horizontal and about 'level with'o the door F; but the rear portion H inclines quite sharply upwardtherefrom and is formed of 'a series of corrugated metal plates, eachresting marginally upon the oblique portion ofthe inclined andhorizontal beams J, sup- ,ported by the front and rear walls A B, Fig."1. The plates II and I are-separately removable, so that a new one canat any time be substituted. Theremay be a horizontal ledge or plate atthe rear of the inclined fioor, as indicated in Fig. 1;.but this is notessential.

jBetween adjacent plates Hiare rows of hollow twyers'K, supported ontheibeams J and suitably secured-in position,"preferably by twyer andkeyed fast underneath. At all other points there is open spacebetweenthe beams, admitting air under pressure from beneath into the twyers andthence into the combustion-chamber through downwardlyextending vents 7cin each lateral face.

The fuel from hopper M is introduced through the rear wall B, at top ofthe inclined bottom H, by means of a screw conveyer suitably actuated.In Fig. 3 the hopper is located at the rear, the conveyer-tube N andscrew 0 run direct therefrom to the furnace, andthe coal is dischargedupon the upper endlo'f, the incline, as stated. In the apparatus shownin Figs. 1 and 2 the hopper is in front, the main conveyor P Q risesobliquely from it, beneath the furnace-bottom, to a transfer-chamber Rin the rear wall. From 0 this chamber a return-tube S extends to thefurnace "at top of the incline and incloses a short reversingconveyor-screw T. The shafts of screws Q and T are connected by suitablegearing U, and when motion isimparted to screw Q the coal brought intochamber R is discharged by screw T into the furnace at top of theinclined floor..

By-reference to Fig'sJl and 2 it will'beseen that each return-tube S andits inclose'd screw T is in position to discharge the fuel upon thecorrugated inclined plate H, between the rows of twyers K, wherecombustion will take place as the fuel gradually works downwardly to thelowest floor-level. The mechanism will be driven by a suitable motor, asV,Fig. 1.

I claim as my invention 1. The combination with a furnace having adownwardly-inclined combustion-surface and an ash-door opposite thelower end thereof, said combustion-surface being constructed to retainthe unconsumed material for removal through said door, of afurnace-stoking apparatus adapted to supply fuel to thecombustion-chamber through the rear wall thereof and to project suchfuel upon said inclined surface.

2. The combination with a furnace having in its rear portionforwardly-inclined combustion-plates and a door opposite the lower endthereof, the entire floor of the combusterposed elevated twyers, of aplurality of screw conveyors introducing fuel through the rear wall anddepositing it on said inclined plates between adjacent rows of twyers.

In testimony whereof I have aflixed my signature in presence of twoWitnesses.

AUGUSTUS F. NAGLE.

Witnesses:

A. FRED .NAGLE, .Tr., G. F. BROWN.

